Aquatic Sciences Meeting, Albuquerque 2001

SS34 Impacts of Aquaculture and Mariculture

Date: Thursday, February 15, 2001, Time: 11:45:00 AM

Location: Sandia/Santa Ana

Yakupitiyage, A, , Asian Institute of Technology, Pathumthani , Thailand, amara@ait.ac.th

Colman, J, A, , Concord, USA, jacolman@usgs.gov

MOVING NUTRIENTS FROM WATER TO FISH BY CULTURE OF THE TILAPIA OREOCHROMIS NILOTICUS IN WASTE-FED TANKS

Pond culture of some filter-feeding tilapia species using nutrient-concentrated waste streams as pond inputs can reverse the usual and problematic flow of nutrients from fertilizer and feedstuffs in agricultural and domestic uses to discharge into surface and ground water. Whereas many aquaculture systems also load nutrients to receiving water, in culture of Oreochromis niloticus, nutrients can be routed from dissolved state through plankton to incorporation into a food-fish species. Demonstrated will be the little recognized circumstances making this possible that include (1) ability of Oreochromis niloticus to filter feed and digest cyanobacteria (2) ease of seeding tanks to develop monocultures of cyanobacteria, (3) balance of primary production and grazing that can be achieved in tanks that at once maximizes growth of cyanobacteria and net production of dissolved oxygen, which otherwise can be limiting in nutrient rich systems. Experimental tanks that generated 5.3 g ww fish/m2/d used human derived septage as a nutrient input. A higher value product may be realized using nutrient by-products from food processing such as brewery waste.

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Aquatic Sciences Meeting, Albuquerque 2001

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